1a fleck mine; larva mines from a transportable case: Coleophora ballotella

1b gallery or blorch; larva mines from the inside => 2

1c galls, etc => Tables for all parasites per species

2a full depth blotch; larvae with sclerotised head => 3

2b mine upper- or lower-surface, always beginning as a gallery; larva a maggot => 4

3a oviposition spot covered by a shining black drop of dried secretion: Trachys scrobiculatus ?

3b no such drop: Dibolia occultans

4a gallery from start to end => 5

4b narrow gallery, abruptly widening into a blotch => 7

5a puparium in the mine, in a, generally lower surface, pupal chamber: Chromatomyia horticola

5b pupation external => 6

6a gallery pinnately branched, main branch on top of the midrib; never a secondary blotch: Liriomyza strigata

6b galley not pinnate, its course not determined by the leaf venation, often ending in a secondary blotch: Liriomyza bryoniae

7a frass in the gallery part in a broad, green central line with minute black granules at either side: Amauromyza labiatarum

7b no central green band; frass in larger fragments => 8

8a frass in the gallery part in irregular black stripes and grains: Amauromyza leonuri

8b frass here in regular thread fragments at either side of the gallery: Amauromyza lamii